US10321940B2 - Hammertoe implant promoting bony in-growth - Google Patents

Hammertoe implant promoting bony in-growth Download PDF

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US10321940B2
US10321940B2 US15/367,932 US201615367932A US10321940B2 US 10321940 B2 US10321940 B2 US 10321940B2 US 201615367932 A US201615367932 A US 201615367932A US 10321940 B2 US10321940 B2 US 10321940B2
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elongated body
bone
joint implant
proximal
proximal portion
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US20170156766A1 (en
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David M. Anderson
Chad Westphal
Pierre Barouk
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Biomet Manufacturing LLC
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Biomet Manufacturing LLC
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Assigned to BIOMET MANUFACTURING, LLC reassignment BIOMET MANUFACTURING, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WESTPHAL, Chad, ANDERSON, DAVID M, BAROUK, Pierre
Priority to US16/400,225 priority patent/US11419646B2/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/72—Intramedullary devices, e.g. pins or nails
    • A61B17/7233—Intramedullary devices, e.g. pins or nails with special means of locking the nail to the bone
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/72—Intramedullary devices, e.g. pins or nails
    • A61B17/7291—Intramedullary devices, e.g. pins or nails for small bones, e.g. in the foot, ankle, hand or wrist
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/42—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
    • A61F2/4225—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for feet, e.g. toes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
    • A61F2002/30622—Implant for fusing a joint or bone material
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30907—Nets or sleeves applied to surface of prostheses or in cement
    • A61F2002/30909—Nets
    • A61F2002/30914—Details of the mesh structure, e.g. disposition of the woven warp and weft wires
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/42—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
    • A61F2/4225—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for feet, e.g. toes
    • A61F2002/4233—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for feet, e.g. toes for metatarso-phalangeal joints, i.e. MTP joints

Definitions

  • Hammertoe is a well-known condition that consists of a contracture of one or both joints of the second, third, fourth or fifth toes. Most commonly the middle joint of the toe in question, the proximal interphalangeal (PIP) joint, is bent at an angle. In severe cases of hammertoe, surgery may be recommended. One such surgery is a tendon transfer procedure. Alternatively, hammertoes may be corrected using a joint arthroplasty (removing part of the bones on both sides of the PIP) or a joint fusion. In the case of a joint fusion, an intramedullary implant is placed into the end of the bones on the opposing sides of the joint and spans the joint. The goal is to fuse the two phalanges on opposing side of the joint where the contracture is occurring together.
  • PIP proximal interphalangeal
  • the present inventors have recognized, among other things, that a problem to be solved can include addressing the fusion and rotational concerns of presently used hammertoe implants in fusion surgery.
  • Presently used implants can suffer the drawback of ineffectively fixing rotation of the phalanges on the opposing sides of the joint, and not effectively promoting bone growth around the implant (which leads to effective fusion).
  • the present subject matter can help provide a solution to this problem, such as by providing an implant with a proximal portion configured for insertion into a first bone and a distal portion configured for insertion into a second bone adjacent to the first bone.
  • the implant further includes an elongated body extending between the proximal portion and the distal portion that defines an elongated body length.
  • the elongated body includes at last one metal rod extending from the proximal portion to the distal portion and a porous mesh extending along at least a portion of the elongated body length.
  • the porous mesh can allow for bony in-growth upon implantation, and the elongated body can define a generally square cross section and can be insertable into circular holes disposed in the first and second bones.
  • the present subject matter further provides a solution to the aforementioned problems by virtue of a method of fusing a first phalanx of a toe to a second phalanx of the toe.
  • the method can include drilling a generally circular hole into the first phalanx; drilling a generally circular hole into the second phalanx; inserting a proximal end of an implant into the first bone, and advancing the implant until tabs positioned on the side of the implant body come into contact with the edge of the first phalanx or anchor within the circular hole in the first phalanx, the implant having a generally square cross-section and containing a metal rod and a porous metal material; and advancing the circular hole in the second phalanx over a distal end of the implant and over the elongated body of the implant until it is positioned proximate the first bone.
  • the porous metal material of the implant promotes bony in-growth of both the first and second phalanges to the implant and aids in fusion.
  • FIG. 1 provides a perspective view of an implant according to at least one example of the present description.
  • FIGS. 2A-2D provide a perspective view, top view, side view and end view, respectively, of an implant according to at last one example of the present description.
  • FIG. 3 provides a perspective view of an implant according to at least one example of the present description.
  • FIG. 4 provides a side view of an implant according to at least one example of the present description.
  • FIGS. 5A-5D provides a number of views of steps in a method of fusing a first phalanx of a toe to a second phalanx of the toe, according to at least one example of the present description.
  • the present description is generally directed to bone implants that are capable of fusing two or more adjacent bones, and particularly to elongated bone implants that promote bony in-growth upon implantation.
  • One exemplary use for such implants is in treating and addressing a hammertoe condition in patients.
  • FIG. 1 provides a perspective view of joint implant 100 .
  • Joint implant 100 can include a proximal portion 102 that is insertable into a first bone and a distal portion 104 that is insertable into a second bone that is adjacent to the first bone.
  • the proximal portion 102 and distal portion 104 can each include a rounded end ( 103 and 105 , respectively).
  • each of the ends 103 and 105 can be generally “bullet-shaped”.
  • the first bone into which the proximal portion 102 is configured to be inserted
  • the second bone into which the distal portion 104 is configured to be inserted
  • the implant 100 can span the proximal interphalangeal (PIP) joint.
  • the first bone can be the middle phalanx and the second bone can be the distal phalanx.
  • the implant 100 can span the distal interphalangeal (DIP) joint.
  • the first bone can be the metatarsal adjacent to a toe and the second bone can be the adjacent proximal phalanx.
  • the implant 100 can be used to span the interphalangeal joint of the hallux (or big toe).
  • Joint implant 100 can comprise an elongated body 106 that extends between the proximal portion 102 and distal portion 104 .
  • the elongated body 106 can define an elongated body length D.
  • Elongated body 106 can include at least one metal rod 108 extending at least partway from the proximal portion 102 to the distal portion 104 along the length D.
  • metal rod 108 can be titanium or a titanium alloy.
  • the metal rod 108 can, in some examples, be integrally formed with the proximal portion 102 and distal portion 104 of the implant 100 .
  • the proximal portion 102 and distal portion 104 can also be made up, at least in part, of titanium or a titanium alloy.
  • the elongated body 106 can further comprise a porous mesh 110 that extends along at a least a portion of the elongated body length D.
  • the porous mesh 110 can allow for or faciliate bony in-growth upon implantation into the first and second bones.
  • the porous mesh can be a porous titanium alloy mesh.
  • a titanium alloy that can be used for porous metal mesh is OsseoTiTM porous metal from Zimmer Biomet (Warsaw, Ind.)
  • OsseoTi is made out of Ti6Al4V and has a porous structure that generally mimics the porous structure of human cancellous bone. It is highly biocompatible and has excellent corrosion resistance.
  • the porous mesh can be Trabecular MetalTM, also from Zimmer Biomet.
  • a material may be formed from a reticulated vitreous carbon foam substrate which is infiltrated and coated with a biocompatible metal, such as tantalum, by a chemical vapor deposition (“CVD”) process in the manner disclosed in detail in U.S. Pat. No. 5,282,861 and in Levine, B. R., et al., “Experimental and Clinical Performance of Porous Tantalum in Orthopedic Surgery”, Biomaterials 27 (2006) 4671-4681, the disclosures of which are expressly incorporated herein by reference.
  • CVD chemical vapor deposition
  • the porous mesh can comprise one or more of a variety of biocompatible metals such as, but not limited to, titanium, titanium alloys, cobalt chromium, cobalt chromium molybdenum, tantalum, tantalum alloys, niobium, or alloys of tantalum and niobium with one another or with other metals, and the like.
  • the porous mesh can be particularly suited for contacting bone and/or soft tissue and can be useful as a bone substitute, implant, or implant component that can be receptive to cell and tissue ingrowth, for example, by allowing and promoting bony tissue or other tissue growth into the porous structure over time to enhance fixation (e.g., osseointegration) between the structure and surrounding bodily structures.
  • the elongated body 106 can also define a generally rectangular and, more particularly, generally square cross section.
  • the cross section of elongated body 106 can be configured for insertion into circular holes disposed in the first and second bones.
  • the rectangular or square cross-section of the implant in opposition to the circular cross-section of the drilled bores can facilitate creation of a static force that can aid in creating an interference fit of the implant in the hole of the bone and can oppose or prohibit rotational movement of the implant upon implantation.
  • the elongated body 106 can comprise a first elongated body portion 106 a that can have a first length 120 and a second a second elongated body portion 106 b that can have a second length 130 .
  • the first length 120 and the second length 130 can be equal or different.
  • the elongate body 106 can further comprise a first diameter 121 .
  • the implant 100 can comprise a proximal portion 102 (or a distal portion 104 ) having a third length 140 .
  • the portion of the proximal portion 102 (or the distal portion 104 ) corresponding to the third length 140 can have a second diameter 141 that can be less than the first diameter 121 of the elongate body 106 .
  • the second diameter 141 can be smaller than the first diameter 121 to facilitate introduction into or through a narrow section of bone to further enhance stability and fixation of the implant 100 .
  • the joint implant 100 can optionally further include first and second tabs 112 a and 112 b .
  • the first and second tabs 112 a and 112 b can be configured to prohibit the proximal portion 102 from being implanted beyond a given distance into the first bone.
  • the first tab 112 a and second tab 112 b can each have a generally triangular profile (as illustrated in FIG. 1 ).
  • other appropriate profile shapes are also contemplated, such as hemispheric (see FIGS. 2A-D ), and the like.
  • the joint implant 100 can include a plurality of metal rods 108 , (see, e.g., rods 108 a and 108 b ).
  • the plurality of metal rods 108 can define a perimeter along the length D of the elongated body 106 .
  • the metal rods 108 a , 108 b can correspond to the overall cross-sectional profile (e.g., can be spaced such that they form a generally square cross-section). Although only two rods 108 a , 108 b are visible in FIG. 1 , the example can include a total of four rods 108 equally spaced around the perimeter of the cross section of the elongated body 106 . In other examples, any number of rods 108 can be used, such as three rods, five rods, six rods, or more.
  • mesh 110 can, in some examples, be at least partially positioned between the plurality of metal rods 108 along at least a portion of the elongated body length D. In some examples at least a portion of the mesh (see, e.g., portions of mesh 110 a ) can extend outside of the perimeter defined by the metal rods. A portion of mesh 110 extending beyond the perimeter created by rods 108 can enable the mesh 110 to contact the surrounding bone after implantation, which can aid in both promoting bony in-growth and in creating a static force to secure the implant 100 . Additionally or alternatively, the mesh 110 does not extend outside of the perimeter defined by the metal rods 108 but can still contact surrounding bone after implantation.
  • implant 200 can comprise a metal rod 208 , and can further comprise a plurality of metal rods (e.g., 208 a , 208 b , 208 c ).
  • the first tab 212 a and second tab 212 b can have a generally hemispheric profile; however, alternative profile shapes are also contemplated.
  • a cross-section 214 of the implant along the elongated body 206 can be generally rectangular, or more particularly, generally square.
  • the elongated body 206 can comprise a first elongated body portion 206 a that can have a first length 220 and a second a second elongated body portion 206 b that can have a second length 230 .
  • the first length 220 and the second length 230 can be equal or different.
  • implant 300 can comprise at least one metal rod 308 .
  • the metal rod 308 can further comprise a hollow core disposed in extending at least part of the length of the metal rod 308 .
  • the metal rod 308 can further include a plurality of voids 316 .
  • Voids 316 can generally run from proximal end 302 to the distal end 304 along elongated body 306 .
  • the voids 316 can be circular or any other appropriate shape and can be positioned at various points along the length and at various points around the perimeter of the body 306 .
  • the voids 316 extend from an exterior surface 318 of rod 308 to the hollow core.
  • Mesh can be positioned within the hollow core such that voids 316 provide a plurality of small openings at which the mesh can come directly into contact with bodily material.
  • Joint implant 300 can provide for more limited openings and surface area where bony in-growth can occur compared to previous examples which can be desirable in some cases.
  • implants described herein can generally extend along a common axis along the length D of elongated body 106 (or 206 , 306 ).
  • other configurations are possible.
  • Implant 400 can have a point 406 a along the elongated body 406 where the axis of the implant is altered.
  • FIGS. 5A-5D illustrate one exemplary method.
  • the method can comprise drilling a generally circular hole 524 into the first phalanx 522 .
  • the method can further comprise drilling a generally circular hole 528 into the second phalanx 526 of the same toe.
  • a proximal portion 102 and a portion of elongated body 106 of an implant 100 can be inserted into the first bone 522 , and the implant can be advanced until tabs 112 positioned on the side of the implant body come into contact with the edge of the first phalanx 522 or anchor within the circular hole 524 in the first phalanx.
  • the implant can have a generally square cross-section and can contain a metal rod and a porous metal material (as provided in implants 100 , 200 , 300 and 400 described above).
  • the interface of the circular holes in the first and second phalanges and the generally rectangular cross-section of the implant can aid in securing the implant and minimizing or eliminating rotation between the first and second phalanges.
  • the method can further comprise advancing the circular hole 528 in the second phalanx 526 over a distal portion 104 of the implant 100 until it is positioned proximate the first bone 522 .
  • the porous metal material of the implant can promote bony in-growth of both the first and second phalanges into the implant, which can aid in fusion.
  • the first phalanx in the method described above can be a proximal phalanx of a given toe and the second phalanx can be a middle phalanx of the given toe.
  • the first phalanx can be a middle phalanx and the second phalanx can be a distal phalanx.
  • Example 1 can include a joint implant, such as a joint implant that can include a proximal portion insertable into a hole disposed in a first bone, a distal portion insertable into a hole disposed in a second bone, the second bone positioned adjacent to the first bone, and an elongated body positioned between the proximal portion and the distal portion.
  • the elongated body defines an elongated body length.
  • the elongated body can comprise at least one metal rod extending from the proximal portion to the distal portion and a porous mesh extending along at least a portion of the elongated body length.
  • the elongated body can define a generally rectangular cross section.
  • Example 2 can include, or can optionally be combined with the subject matter of Example 1, to optionally include the first bone comprising a proximal phalanx of a toe and the second bone comprising a middle phalanx of a toe.
  • Example 3 can include, or can optionally be combined with the subject matter of Example 1 to optionally include the first bone comprising a middle phalanx of a toe and the second bone comprising a distal phalanx of a toe.
  • Example 4 can include, or can optionally be combined with the subject matter of Example 1 to optionally include the first bone comprising a metatarsal and the second bone comprising a proximal phalanx.
  • Example 5 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1-4 to optionally include the proximal portion and the distal portion each include a rounded end.
  • Example 6 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1-5 to optionally include the porous mesh includes a porous titanium alloy mesh.
  • Example 7 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1-6 to optionally include the metal rod comprises titanium.
  • Example 8 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1-7 to optionally include first and second tabs extending outwardly from the elongated body, the first and second tabs positioned on opposing sides of the elongated body.
  • Example 9 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1-8 to optionally include first and second tabs configured to prohibit the proximal portion from being implanted beyond a given distance into the first or second bone.
  • Example 10 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1-9 to optionally include first and second tabs having a generally hemispheric profile.
  • Example 11 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1-9 to optionally include first and second tabs have a generally triangular profile.
  • Example 12 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1-11 to optionally include the at least one metal rod comprises a plurality of metal rods which define a perimeter along the length of the elongated body and corresponding to the overall cross-sectional profile.
  • Example 13 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1-12 to optionally include the porous mesh positioned generally between the plurality of metal rods along at least a portion of the elongated body length.
  • Example 14 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1-13 to optionally include wherein at least a portion of the porous mesh extends outside of the perimeter defined by the metal rods to enable contact with surrounding bone after implantation.
  • Example 15 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1-13 to optionally include wherein at least a portion of the porous mesh remains within the perimeter defined by the metal rods.
  • Example 16 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1-15 to optionally include at least one metal rod includes a hollow core and a plurality of voids extending from an exterior surface of the rod to the hollow core.
  • Example 17 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1-16 to optionally include the distal and distal portions being integrally formed with the at least one metal rod.
  • Example 18 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1-17 to optionally include that the distal and distal portions comprise titanium.
  • Example 19 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1-18 to optionally include wherein the elongated body defines a generally square cross section.
  • Example 20 can include a joint implant comprising a proximal portion that can be insertable into a hole disposed in a first bone, a distal portion that can be insertable into a hole disposed in a second bone, the second bone positioned adjacent to the first bone, and an elongated body extending between the proximal portion and the distal portion and defining an elongated body length.
  • the elongated body can comprise a plurality of metal rods that can extend from the proximal portion to the distal portion and a porous mesh that can extend along at least a portion of the elongated body length.
  • the elongated body can define a generally rectangular cross section.
  • the plurality of metal rods, the proximal portion, and the distal portion can be integrally formed.
  • Example 21 can include a method of fusing a first phalanx of a toe to a second phalanx of the toe.
  • the method can include drilling a generally circular hole into the first phalanx; drilling a generally circular hole into the second phalanx; inserting a proximal end of an implant into the first bone, and advancing the implant until tabs positioned on the side of the implant body come into contact with the edge of the first phalanx or anchor within the circular hole in the first phalanx, the implant having a generally square cross-section and containing a metal rod and a porous metal material; and advancing the circular hole in the second phalanx over a distal end of the implant and over the elongated body of the implant until it is positioned proximate the first bone.
  • the porous metal material of the implant promotes bony in-growth of both the first and second phalanges to the implant and aids in fusion.
  • Example 22 can include, or can optionally be combined with the subject matter of Example 22 to optionally include the interface of the circular holes in the first and second phalanges and the general rectangular cross-section of the implant aiding in securing the implant and minimizes rotation between the first and second phalanges.
  • Example 23 can include, or can optionally be combined with the subject matter of one or any combination of Examples 21-22 to optionally include the first phalanx being a proximal phalanx and the second phalanx being a middle phalanx.

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Medical Informatics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Neurology (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Vascular Medicine (AREA)
  • Prostheses (AREA)
US15/367,932 2015-12-03 2016-12-02 Hammertoe implant promoting bony in-growth Active US10321940B2 (en)

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Application Number Priority Date Filing Date Title
US15/367,932 US10321940B2 (en) 2015-12-03 2016-12-02 Hammertoe implant promoting bony in-growth
US16/400,225 US11419646B2 (en) 2015-12-03 2019-05-01 Hammertoe implant promoting bony in-growth

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US201562262494P 2015-12-03 2015-12-03
US15/367,932 US10321940B2 (en) 2015-12-03 2016-12-02 Hammertoe implant promoting bony in-growth

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US11419646B2 (en) 2022-08-23
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EP3383296A1 (fr) 2018-10-10
US20190254722A1 (en) 2019-08-22

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